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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e21941fc35e5051aae3b05b9632c5d6a96f9a5eaadada239425c0b14fa3269ec' 
  AND token = 'Ejjo6YYllZeyb59c7wZbVXWTsinUn5PSSMgZvzB3VaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}